Upper St. Clair leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About more than 99% of adults in Upper St. Clair typically vote, above the U.S. average of about 62%. Among adults in Upper St. Clair, ~57% vote Democratic, ~45% Republican, and ~-2% don't vote. The map below shows estimated turnout by block group.
How Upper St. Clair compares
Among cities within 25 miles, Upper St. Clair leans more Democratic than 201 of 247 neighbors.
Upper St. Clair runs about 13 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and Upper St. Clair sits clearly on the Democratic side.
Why Upper St. Clair leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Upper St. Clair, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 75% of adults in Upper St. Clair hold a bachelor's degree, about 47 points above the U.S. average of 28%. Dense areas vote Democratic, and Upper St. Clair sits in the top fifth on density (about 87%, above 96% of cities). Upper St. Clair runs against the grain of Pennsylvania, a Democratic-leaning outlier in a roughly evenly split state.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Upper St. Clair, PA sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Upper St. Clair looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Upper St. Clair is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Upper St. Clair have completed high school, above 96% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Morgan, PA R+17
- Bridgeville, PA Even
- Bethel Park, PA D+5
- Lawrence, PA R+12
- Castle Shannon, PA D+10
- Heidelberg, PA D+10
- Presto, PA R+5
- Hendersonville, PA R+11
- Venetia, PA R+19
- Dormont, PA D+39
Cities with Similar Populations
- East Patchogue, NY R+13
- Lake Zurich, IL D+10
- North Tustin, CA R+9
- North Plainfield, NJ D+31
- Florida City, FL D+17
- Clarks Summit, PA Even
- Granite Bay, CA R+11
- Twinsburg, OH D+21
- Covington, WA D+11
- Florida Ridge, FL R+16
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Pennsylvania Department of State, Bureau of Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.